Install Microsoft Office 365 on up to 5 devices

Microsoft Office 365 is a subscription-based version of Microsoft Office 2013
Unlike any of the traditional Office suites such as Office 2010, Office 365 allows you to install Office applications on up to five different PCs and Macs, and mobile devices.

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Paying a subscription fee for Microsoft Office 365 Home Premium does have one huge advantage: You can install Office on up to five devices, and these can include both Windows machines and Macs. Microsoft says you'll be able to install the suite on additional, select mobile devices "when available," which is a cryptic way of not promising apps for the big two mobile OSes, while still dangling the carrot

The Home Premium version of Office includes Word, Excel, PowerPoint, Outlook, Publisher, OneNote, and Access. OneNote is not included in the Mac version.